The New York police department added extra protection to key sites following the attack on Wednesday in London that was being investigated as a “terror incident”.

Police in the US city have re-deployed long-gun teams to the British consulate, City Hall and Grand Central station, J. Peter Donald, a spokesperson, said on Twitter.

“We are making those deployments in New York until we know more,” he said, cautioning that there was “no info linking [the] London attack to NYC at this point”.

The US department of homeland security, meanwhile, said that the country’s “domestic security posture remains unchanged,” but that along “with our partners in federal law enforcement, we are in close contact with our British counterparts to monitor the tragic events and to support the ongoing investigation”.

The attack in London took place in the vicinity of parliament, an area that is typically crowded with locals, tourists and students. Metropolitan Police said four people, including the attacker, have died, and at least another 20 people injured after an assailant stabbed a police guard and a car ploughed through pedestrians on the nearby Westminster Bridge.

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